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Effect of oxidation and heat treatment on the morphology and electronic structure of carbon-encapsulated iron carbide nanoparticles

机译:氧化和热处理对碳包裹的碳化铁纳米粒子形貌和电子结构的影响

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摘要

Carbon-encapsulated iron carbide nanoparticles have been produced by co-carbonization of a mixture of an aromatic heavy oil and ferrocene at 450 ℃ under autogenous pressure. Transformations of the morphology and electronic structure of nanoparticles induced by air oxidation and subsequent heat treatment in a nitrogen atmosphere were examined using transmission electron microscopy, X-ray diffraction, near edge X-ray absorption fine structure spectroscopy, and X-ray emission spectroscopy. It was found that hollow nanoparticles, composed of iron oxides and oxidized carbon, were developed with thermal air oxidation of the initial product at 280 ℃ for 5 h. The mild oxidation of the product (250 ℃ for 3 h) followed by the carbonization at 500-550 ℃ yielded the hollow nanoparticles containing iron carbide/oxides and defective graphite-like carbon. The further annealing of nanoparticles at 1000 ℃ produced carbon nanocapsules with highly graphitized carbon walls and partially filled by spherical iron carbide nanoparticles.
机译:碳包封的碳化铁纳米粒子是通过在自生压力下于450℃将芳烃重油和二茂铁的混合物共碳化而制得的。使用透射电子显微镜,X射线衍射,近边缘X射线吸收精细结构光谱和X射线发射光谱检查了空气氧化和随后在氮气氛中进行热处理引起的纳米颗粒的形貌和电子结构的转变。发现初始产物在280℃热空气氧化5h后,形成了由氧化铁和氧化碳组成的中空纳米粒子。产物的温和氧化(250℃持续3 h),然后在500-550℃碳化,得到的空心纳米颗粒含有碳化铁/氧化物和有缺陷的类石墨碳。纳米粒子在1000℃进一步退火,制得的碳纳米胶囊具有高度石墨化的碳壁,并且部分被球形碳化铁纳米粒子填充。

著录项

  • 来源
    《Materials Chemistry and Physics》 |2012年第1期|235-240|共6页
  • 作者单位

    Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia Novosibirsk State Technical University, 630092 Novosibirsk, Russia;

    Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia Novosibirsk State Technical University, 630092 Novosibirsk, Russia;

    Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, Russia Novosibirsk State Technical University, 630092 Novosibirsk, Russia;

    Institute of Solid State Physics, Dresden University of Technology, D-01062 Dresden, Germany;

    State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 100029 Beijing, PR China;

    State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 100029 Beijing, PR China;

    State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 100029 Beijing, PR China;

    State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, 100029 Beijing, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    carbon-encapsulated iron carbide; nanoparticles; electronic structure; NEXAFS; X-ray emission spectroscopy;

    机译:碳包碳化铁;纳米粒子电子结构NEXAFS;X射线发射光谱;

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